Improvement in harrow-teeth



AUNITED STATES PILI'I'EN'I'A OFFICE.

WILLIAM W. SPEER, 0F PITTSBRG, PENNSYLVANIA.

IMPROVEMENT IN HARROW-TEETH. i

Specification forming part of Letters Patent No. 182,237, datedSeptember 12, 1876; application led May 27, 1876.

To all whom it may concer-n:

Be it known that I, WILLIAM W. SPEER,

ot Pittsburg, in the county of Allegheny and State of Pennsylvania,'haveinvented certain new and useful Improvements in Harrow- Teeth; and-I dohereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art towhich it appertains to make and use th same, reference beingvhad to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specication.

My invention relates to teeth designed for harrows, cultivators, andlike ground-disintegrating implements; and consists in,"flrst, a toothwhose body has grooved faces provided with constant plane edges; second,a quadrilateral tooth having parallel and grooved sides, and providedwith a plane-sided point.

In the drawings, Figure 1 is a view of my barrow-tooth in workingposition, while Fig. 2 represents a crosssection of the body of thetooth.

A is the tooth, formed of any suitable metal or Working material, as Imay desire, and in proportion applicable to the occasion. a is itspoint, constructed, as customary, with corresponding square faces, butwhich, as extended or carried up into the body proper of the tooth,changes or develops into an gular recesses or grooved depressions, theplane of whose central surface is well sunk below that of its retainingedges-that is, while I give the well-known right-angular sides to thepoint of the tooth, I allow the edges to continue on in the ordinaryproportionment, so as to ill up in outline the four outlying or boundingpoints l or edges of the tool, and yet channel out the intervening facesor sides, so as to cause such latter to be well below said former. Anysuitable process of obtaining "such a result may be employed ,and I donot confine myself to any means of rolling out the device, but broadlyclaim the article itself in question.

The advantages of such a construction, embodying greater strength ofwearing property with extreme lightness of weight, all obtained at aless cost on account of the smaller amount of metal required in therolling, are too obvious to call for particular observation.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

A quadrilateral grooved tooth, having parallel sides and a plane-sidedpoint, substantially as and for the purpose described.

In testimony that I claim the foregoing as my own I atlix my signaturein presence of two Witnesses. l

WILLIAM W. SPEER.

Witnesses:

FRANCIS FORRANGE, THOMAS D. GRAHAM.

